Покопался в тексте соглашения. Вот что там написано: «You are not entitled to [… тут немного пропущено...] emulate or redirect the communication protocols used by Valve in any network feature of the Software, through protocol emulation, tunneling, modifying or adding components to the Software, use of a utility program or any other techniques now known or hereafter developed, for any purpose including, but not limited to network play over the Internet, network play utilizing commercial or non-commercial gaming networks or as part of content aggregation networks, without the prior written consent of Valve».